There is a joke about economists;
When an economist is asked how he/she would open a can of beans when stuck on an isolate Island with nothing but the can, he/she would answer; "first, I PRESUME I have a canopener"!

In economics, there are a lot of presumptions, creating a model-world, before one actually starts to solve the problem at hand. - BUT - after these have been said, it is pure math and/or statistics for a while ( though keeping the presumptions in mind at all times ).
And then you tell it in words what you have figured out in math/statistics; what the model has solved.
Noticing details, as in math, is important.
Getting an overview might be easy, with PR, but learning the models asks for noticing the many details.
Or, as Iam2 pointed out so well (thanks!!It was helpful for me too!)
Asking questions like:
Iam2:
Why is this work limited?
Why is it flawed?
Where is the new idea?
What is the key step?
So far I end up regular read when I get to these parts in economics, but I know PR can help me get over that; I guess it is all about getting your mind to focus on the right parts; which means asking the right questions; to get you to notice the right details that crack the problem open, - and is then ready to be solved 
Why do you ask? Are you studying math/economics too?